Environmental control under-pressure liquid supplementing device for oil field

Abstract

The invention discloses an environment-control pressurized liquid supplementing device for an oil field, relates to the technical field of oil field exploitation, and aims to solve the problems that the existing liquid supplementing process is discontinuous and a pump truck and a pressing device need to be additionally connected, the environment-control pressurized liquid supplementing device for the oil field comprises a liquid supplementing assembly, and the liquid supplementing assembly comprises a liquid supplementing tank and a gas-liquid separator; the gas-liquid separator is communicated with a gas return pipe and a liquid supplementing pipe, the gas return pipe is arranged above the liquid supplementing pipe, the other end of the gas return pipe is communicated with the top end of the liquid supplementing tank, and the other end of the liquid supplementing pipe is communicated with the side wall of the liquid supplementing tank; and the gas-liquid separator is also communicated with a wellhead.

Description

Technical Field

[0001] This invention relates to the technical field of oilfield development, and specifically to an oilfield-use ring-controlled pressurized fluid replenishment device. Background Technology

[0002] Oilfield fluid replenishment refers to the replenishment of white oil (a highly refined, colorless, and odorless mineral oil) into oil well pipelines. It is a common operational measure with multiple functions, the core purpose of which is to ensure the safe production of oil wells, maintain stable production, and extend equipment life.

[0003] Because pressure relief is required during the replenishment process—that is, adding white oil into the pipeline increases the pressure, necessitating pressure relief to maintain the pipeline pressure—current replenishment devices are mostly intermittent. After replenishment, the device needs to be removed from the pipeline and reinstalled when replenishment is needed. This type of device cannot replenish in real time, meaning it cannot replenish according to the pipeline conditions. Furthermore, existing replenishment processes require the use of pump trucks and pressure-pressurizing replenishment devices to add white oil into the pipeline. Summary of the Invention

[0004] To address the aforementioned problems—namely, the discontinuous nature of existing fluid replenishment processes and the need for additional connections to pump trucks and pressurization devices—this invention proposes an oilfield-use ring-controlled pressurized fluid replenishment device. This device includes an integrated fluid replenishment unit comprising a replenishment tank and a gas-liquid separator. The gas-liquid separator is connected to a return gas pipe and a replenishment pipe. The return gas pipe is positioned above the replenishment pipe, with its other end connected to the top of the replenishment tank. The other end of the replenishment pipe is connected to the side wall of the replenishment tank. The gas-liquid separator is also connected to the wellhead.

[0005] A further feature of the present invention is that the replenishment system comprises three sets, which are connected in parallel, and the bottom of the replenishment tank is also connected to an oil replenishment pump for replenishing white oil into the replenishment tank.

[0006] A further provision of the present invention is that: a recovery pipe is connected to the return gas pipe, the recovery pipe is located below the return gas pipe, the other end of the recovery pipe is connected to a recovery tank, and the bottom end of the recovery tank is connected to the bottom end of the replenishment tank.

[0007] A further provision of the present invention is that the bottom end of the replenishment tank is also connected to an energy storage device, and the replenishment pipe is also connected to an energy storage device.

[0008] The beneficial effects of this invention are as follows:

[0009] 1. The replenishment tank can replenish white oil into the wellhead through the gas-liquid separator. The high-pressure gas discharged from the wellhead can be separated by the gas-liquid separator and filled into the replenishment tank through the return gas pipe to pressurize the white oil in the replenishment tank, thereby driving the white oil to replenish into the wellhead, achieving the purpose of automatic pressure replenishment. There is no need to install an additional pressure device. At the same time, the replenishment system can achieve automatic and continuous replenishment according to the pressure in the wellhead.

[0010] 2. By setting up an energy storage device, pressure can be recovered and stored. When the pressure inside the well is too high, the replenishment tank can release the pressure into the energy storage device for storage. When the pressure inside the well is low, the energy storage device will release the pressure, thereby ensuring the normal pressure during the replenishment process.

[0011] 3. By setting up a recovery tank, the white oil that has been carried into the inlet and outlet gas pipes can be recovered. Attached Figure Description

[0012] Figure 1 A schematic diagram of the structure when installing a set of fluid replenishment units is shown.

[0013] Figure 2 A schematic diagram of the structure of the present invention is shown. Figure 1 .

[0014] Figure 3 A schematic diagram of the structure of the present invention is shown. Figure 2 .

[0015] Figure 4 A schematic diagram of the structure of the present invention is shown. Figure 3 .

[0016] Attached reference numerals: 1. Liquid replenishment unit; 11. Liquid replenishment tank; 111. Liquid level gauge; 2. Gas-liquid separator; 3. Gas return pipe; 4. Liquid replenishment pipe; 5. Oil replenishment pump; 6. Recovery tank; 7. Energy storage device. Detailed Implementation

[0017] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0018] This invention proposes an oilfield-use ring-controlled pressurized fluid replenishment device, comprising a fluid replenishment system 1, of which three sets are arranged in parallel. The fluid replenishment system 1 includes a fluid replenishment tank 11 and a gas-liquid separator 2. The fluid replenishment tank 11 is vertically arranged, while the gas-liquid separator 2 is horizontally arranged. A return gas pipe 3 and a fluid replenishment pipe 4 are connected to the gas-liquid separator 2, with the return gas pipe 3 positioned above the fluid replenishment pipe 4. An oil replenishment pump 5 is connected to the fluid replenishment tank 11, capable of replenishing white oil into the fluid replenishment tank 11.

[0019] The other end of the return gas pipe 3 is connected to the top of the replenishment tank 11, and the other end of the replenishment pipe 4 is connected to the side wall of the replenishment tank 11. The gas-liquid separator 2 is also connected to the wellhead. In this way, the high-pressure gas discharged from the wellhead will be filled into the replenishment tank 11 from the top of the replenishment tank 11 through the return gas pipe 3 under the action of the gas-liquid separator 2. Then, under the action of the high-pressure gas, the white oil in the replenishment tank 11 can be filled into the gas-liquid separator 2 through the replenishment pipe 4, and then filled into the wellhead by the gas-liquid separator 2, so as to realize the process of automatically and continuously replenishing oil into the wellhead.

[0020] It should be noted that a level gauge 111 is also installed on the replenishment tank 11. Both ends of the level gauge 111 are connected to the replenishment tank 11, so that the level of white oil in the replenishment tank 11 can be observed through the level gauge 111.

[0021] The return gas pipe 3 is also connected to a recovery pipe, which is located below the return gas pipe 3. The other end of the recovery pipe is connected to a recovery tank 6. The white oil that is carried into the return gas pipe 3 by the high-pressure gas can be recovered into the recovery tank 6 through the recovery pipe, thereby realizing the recovery of white oil. At the same time, the bottom end of the recovery tank 6 is also connected to the bottom end of the replenishment tank 11, so that the recovered white oil can be replenished into the replenishment tank 11 for reuse.

[0022] The bottom of the replenishment tank 11 is also connected to two energy storage devices 7 arranged in series. When the gas pressure discharged from the wellhead is high, some of the pressure will be dispersed into the energy storage pipe and stored by the energy storage device 7. When the gas pressure discharged from the wellhead is less than the pressure in the energy storage device 7, the pressure in the energy storage device 7 will be replenished back into the replenishment tank 11 to assist the replenishment tank 11 in replenishing the liquid and ensuring the replenishment pressure.

[0023] An energy storage device 7 is also connected to the replenishment pipe 4. A valve is installed on the pipe connecting the replenishment pipe 4 and the energy storage device 7. The valve is normally closed. When the total pressure in the system is too high, the valve is opened, allowing the energy storage device 7 connected to the distribution pipe to enter the system, thereby alleviating the problem of excessive total pressure in the system.

[0024] It should be noted that each tank in this application is equipped with a pressure gauge to observe the pressure inside the tank, and valves are also installed on the pipelines to control their operation and switching on / off states under different working conditions. The output of the pressure gauge is electrically connected to a PLC programmable controller to transmit the pressure signal from each tank to the PLC. All valves are electromagnetic control valves and are also electrically connected to the PLC. This means the PLC can output control signals to the valves based on the pressure signal to control their opening and closing. By controlling the opening and closing states of different valves, different operating conditions within the system are maintained, further achieving the goal of automated control system operation. It should also be noted that other electrical components in the system are also electrically connected to the PLC to output corresponding signals and initiate corresponding operating conditions based on those signals, thus achieving automated control of the entire system.

[0025] In summary, in this invention, the replenishment tank 11 can replenish white oil into the wellhead through the gas-liquid separator 2. The high-pressure gas discharged from the wellhead can be separated by the gas-liquid separator 2 and injected into the replenishment tank 11 through the return gas pipe 3 to pressurize the white oil in the replenishment tank 11, thereby driving the white oil to replenish into the wellhead, achieving the purpose of automatic pressure replenishment, eliminating the need for additional pressure devices. At the same time, the replenishment integration 1 can achieve automatic and continuous replenishment according to the pressure conditions in the wellhead.

[0026] By setting up the energy storage device 7, pressure can be recovered and stored. When the pressure inside the well is too high, the replenishment tank 11 can release the pressure into the energy storage device 7 for storage. When the pressure inside the well is low, the energy storage device 7 releases the pressure, thereby ensuring the normal pressure during the replenishment process.

[0027] By setting up a recovery tank 6, the white oil that has been brought into the inlet and outlet gas pipes 3 can be recovered.

[0028] The device has a high degree of automation and can perform automated processing functions.

[0029] Although the invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0030] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0033] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An oilfield-use ring-controlled pressurized fluid replenishment device, characterized in that: The system includes a liquid replenishment system (1), which includes a liquid replenishment tank (11) and a gas-liquid separator (2). The gas-liquid separator (2) is connected to a return gas pipe (3) and a liquid replenishment pipe (4). The return gas pipe (3) is located above the liquid replenishment pipe (4). The other end of the return gas pipe (3) is connected to the top of the liquid replenishment tank (11), and the other end of the liquid replenishment pipe (4) is connected to the side wall of the liquid replenishment tank (11). The gas-liquid separator (2) is also connected to the wellhead.

2. The oilfield-use ring-controlled pressurized fluid replenishment device according to claim 1, characterized in that: The replenishment unit (1) is provided in three sets, and the three sets of replenishment units (1) are arranged in parallel. The bottom end of the replenishment tank (11) is also connected to an oil replenishment pump (5) for replenishing white oil into the replenishment tank (11).

3. The oilfield-use ring-controlled pressurized fluid replenishment device according to claim 1 or 2, characterized in that: The return gas pipe (3) is connected to a recovery pipe, which is located below the return gas pipe (3). The other end of the recovery pipe is connected to a recovery tank (6), and the bottom end of the recovery tank (6) is connected to the bottom end of the replenishment tank (11).

4. The oilfield-use ring-controlled pressurized fluid replenishment device according to claim 1, characterized in that: The bottom of the replenishment tank (11) is also connected to an energy storage device (7), and the replenishment pipe (4) is also connected to an energy storage device (7).

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